Sony has a good interview with Tim Heydelaar, EQ2 Environment Lead, up at their EQ2 Players website. There is lots of good Rise of Kunark information there.

The easiest way to describe the worlds in Kunark is huge. Basically, we're taking several zones and fusing them together to get a more seamless and progressive feel. Less zoning, more playing, and even more exploring, being one of the goals. Within each zone, you'll find several distinct areas  for example, the Fens of Nathsar has remnants of areas such as the Field of Bone, Swamp of No Hope, Ruins of Cabilis and more.